GEOLOGY Earth’s magnetic poles have switched places countless times in the history of our planet. It has happened 183 times within the past 83 million years alone.
This makes an average
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GEOLOGY Earth’s magnetic poles have switched places countless times in the history of our planet. It has happened 183 times within the past 83 million years alone.
This makes an average
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This Erratic Planet: What Happens When the Earth Changes Its Axis of Rotation
byIan Niall RankinEbook
Comets and Meteors Their phenomena in all ages; their mutual relations; and the theory of their origin.
byDaniel Kirkwood